brendon

This is my last post on this topic, but I am going to have the exhaust shop order the mandrel bends for my y pipe, 2.5" would be easier to fabricate than 3", is the 3" going to give a noticeable gain over the 2.5" with just a 224/.561.112 lsa cam and intake stuff? Just need a quick response if possible <img src="gr_images/icons/wink.gif" border="0">

99MONGOOSE

The 3 inch may cost you a little torque at the very low end but it should make up for it at the top. I would go 3 inch because you may later add some good ported heads, then you won't have to have another y-pipe made.

brendon

So when you say low end, are you talking 2K rpms- 3K ?? I like the low end torque, but if I am giving up a lot up top by going 2.5", I would rather go 3". i know that just a y pipe won't effect performance that much, but it does effect throttle response.

RPM WS6

iTrader: (3)

Someone on here recently said that they gained 6rwhp and 6rwtq going from a 2.5” to a 3” Y-pipe on their car. It had headers and I believe just a cam (stock heads). Might have had heads too though, not quite sure on that. I don’t think he saw any losses in low rpms that I can remember.

I’d go 3”.

brendon

3" it is then <img src="graemlins/fluffy.gif" border="0" alt="[Fluffy]" />

unfcamaro

brendon

I live in jax as well and I was also thinking of a shop making a y-pipe for me. What shop are you going with and how much are they charging if you do not mind me asking. Also, I had abad experience w/ rainbow muffler on Cassat if that means anything to you.

BIGBOS

Have you checked out the other thread about the flow master collecter?

Nine Ball

iTrader: (38)

I have to disagree, bigger isn't better in this case. I still run a 2.5" Y-pipe (FLP) on my car and it isn't hurting me a bit. I've tested several different exhaust setups on this car also.

I'd say you shouldn't consider 3" Y-pipes until you are at least 450 rwhp. Now, if you are running catalytics, then 3" might be okay.

Tony

Sears

I currently have the FLP 2.5" y-pipe but will be trying a 3" soon. I'll report back with dyno/track results.

BIGBOS

Sounds good

2000SLVR_Z28

How much are they charging for the mandrel bent pieces? I'd love to be able to do this!

WeatherGuy

[quote]Originally posted by Nine Ball:
<strong>I have to disagree, bigger isn't better in this case. I still run a 2.5" Y-pipe (FLP) on my car and it isn't hurting me a bit. I've tested several different exhaust setups on this car also.

I'd say you shouldn't consider 3" Y-pipes until you are at least 450 rwhp. Now, if you are running catalytics, then 3" might be okay.

Tony</strong><hr></blockquote>

Tony,

Obviously in my case I needed the 3" Y-pipe. However, I would have thought that you would have needed it as well. Did it not make a difference on your all-bore motor with the T2? I find that kind of surprising . . .

brendon

I think the mandrel pre bent peices are around $20 a bend <img src="graemlins/gr_barf.gif" border="0" alt="[barf]" /> But it is the only option unless you can find a shop with a mandrel bender,which in Florida is very hard to find.

brendon

I am having my y pipe made a Muffler City and Brake on Sunbeam Rd. in Jax. They are pretty good over there, email me if you have any questions about them.

Nineball: Do you mean that with 3" I will not gain much over the 2.5" or that I will lose power? I assume that the 2.5" will give slightly better low end response but I can't see them making that much of a difference since I still have my WS6 catback with a flowmaster in place of the stock muffler which doesn't flow all that well anyway.

iLLuSiON

I just had my 3" y-pipe made today. It is all mandrel-bent and looks just beautiful. You probably won't be able to find aluminized mandrel bends (or at least I couldn't), so I got some high temp aluminum coating paint (http://www.por15.com/hightempcoating...BrightAluminum) and painted the y-pipe. It just looks amazing. I should be getting pictures of it soon, email me if interested.

As far as power goes, I can't really say because my exhaust change was pretty drastic. I had 2.5" true duals and switched over to a y-pipe setup again. I was going to go with a 2.5" y-pipe, but was convinced to going with a 3" into a flowmaster 3" in/3.5" out collector.

I was worried about clearance at first with the 3" y-pipe, but to my suprise everything is okay so far. My car is lowered with the Eibach springs.

Jantzer98SS

iTrader: (54)

[quote]Originally posted by Nine Ball:
<strong>I've tested several different exhaust setups on this car also.</strong><hr></blockquote>

1) Just how bad is the Grot collector?

2) What would you recommend for a good streetable exaust considering this darn TP4400?

3) Is open headers the way to go on the dyno and at the track?

I like to change my exaust around about as much as you change your wheels. <img src="gr_grin.gif" border="0">